狮子洋通道锚碇基础承载性能数值模拟研究

Numerical Simulation Study on the Bearing Capacity of the AnchorageFoundation of Shiziyang Bridge

以狮子洋大桥锚碇设计方案为背景,采用有限元数值分析方法对狮子洋大桥锚碇的双缆圆形锚碇、双缆8字形锚碇、四缆横向8字形+群桩锚碇3种设计方案开展比选分析。结果表明,双缆圆形锚碇设计方案的水平变位值为0.66 cm,双缆8字形锚碇设计方案的水平变位值为0.87 cm,四缆横向8字形+群桩锚碇设计方案的水平变位值为3.33 cm。双缆圆形锚碇设计方案的最大主压应力为5 213 kPa,最大主拉应力低于2 200 kPa;双缆8字形锚碇设计方案的最大主压应力为4 122 kPa,最大主拉应力低于2 200 kPa;四缆横向8字形+群桩锚碇设计方案的桩顶内侧存在压应力集中、拉应力超标现象。经综合分析,双缆8字形锚碇设计方案的受力与经济效益较好,同时开展了锚碇尺寸优化设计,表明锚碇按照97 m直径双缆8字形锚碇方案进行优化设计是可行的。

Taking the design scheme of Shiziyang Bridge anchorage as an example,finite element numerical analysis method is used to compare and analyze three design schemes of double cable circular anchorage,double cable 8-shaped anchorage,and four cable horizontal 8-shaped+group pile anchorage.The results show that the horizontal displacement value of the double cable circular anchorage design scheme is 0.66 cm,the one of the double cable 8-shaped anchorage design scheme is 0.87 cm,and the one of the four cable horizontal 8-shaped+group pile anchorage design scheme is 3.33 cm.The maximum principal compressive stress of the double cable circular anchorage design scheme is 5213 kPa,and the maximum principal tensile stress is less than 2200 kPa;The maximum principal compressive stress of the double cable 8-shaped anchorage design scheme is 4122 kPa,and the maximum principal tensile stress is less than 2200 kPa;There is a phenomenon of concentrated compressive stress and excessive ten-sile stress on the inner side of the pile top in the design scheme of four cable horizontal 8-shaped+group pile an-chorage.After comprehensive analysis,the design scheme of the double cable 8-shaped anchorage has good stress and economic benefits.At the same time,the design of theanchorage size has been optimized which indicate that design scheme of the anchorage optimized by 97 m diameter double cable 8-shaped anchorage is feasible.